Precious metal alloy composition



Patented Jan. 8, 1935 V UNITED STATES PATENT OFFICE PRECIOUS METAL ALLOY COMPOSITION Norris 0. Taylor, Minneapolis, Minn., assignor to Spyco Smelting and Refining Company, Minneapolis, Minn.

No Drawing. Application September 26, 1934, Serial No. 745,587

1 Claim. (Cl. 75-1) My invention relates to precious metal alloy Among the advantages of my alloy are the folcompositions. It relates more particularly to lowing: compositions of this character for use in wrought 1. It resists oral and atmospheric corrosion. and cast dental work and for use in manufactur- 2. It melts smoothly and casts easily. 5 ing jewelry. An object of the invention in gen- 3. It is lighter in weight than the conventional 15 eral is to produce an alloy which has distinct dental casting gold alloys. advantages for such uses and an object in par- 4. It is of pleasing color. ticular is to improve on the composition disclosed 5. The melting range is in the same temperaand claimed in my Patent No. 1,965,012, issued ture range as that of gold alloys commonly used July 3, 1934. in dentistry and is considerably lower than that 10 The full objects and advantages of my invenof the alloy disclosed in my'prior patent above tion will appear in connection with the detailed referred to. description thereof and the novel featuresof the The use of indium is of particular importance invention will be particularly pointed out in the in controlling or improving color, corrosion reclaim. sistance, melting range, hardness, and strength. 15

In carrying out my invention, I utilize the fol- I claim: lowing elements combined in proportions by A precious metal alloy composition composed weight within the following ranges: I of from 25 to 65% of gold, from 2 to 25% of pal- Per cent ladium, from 10 to 33% of silver, from 10 to 25% Gold to of copper, and from to 5% of indium. 20

Palladium 2 to 25 V Silver; 10 to 33 NORRIS O. TAYLOR. Copper 10 to 25 Indium; to 5 

